GunnerMan Mac OS

GunnerMan Mac OS

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This is a somewhat longer question, as this is unfamiliar ground for me, so please bear with me I'll try to be specific and explain my reasoning, so that it is useful to more users. I've put the most pressing questions in bold-face.
I have a 2-bay nas (Ts251B; 'Local Nas') and a 1-bay nas (Ts112P, 'Remote Nas') and I'm trying to set them up so that my data is most secure. The Ts251B is going to be my main (on-site) nas, the Ts112P will be located off-site and won't usually be accessed by users directly.
Now, my initial thoughts are:  Use drives 1 of the Local Nas as the main/master drive for my data.
 Sync this drive to the Remote Nas. Sync-Option 1: one-way sync with RTRR (1x/day) (I guess one-way syncing isn't really 'syncing' in the strict sence of the word, but I'll roll with it). Sync-Option 2: two-way sync with Syncthing (~instantaneously). Operationally there's no big difference between one- and two-way syncing, as I'll not usually make changes directly to the Remote Nas. I have a slight preference for Option 2, in case the Local Nas might be unavailable at times.
 Use drive 2 of the Local Nas for daily, weekly, monthly etc. snapshots of its first drive.
This setup would protect against local disaster (fire / burglary) at one of the sites, as well as one of the HDDs crashing. 
However, I'm now thinking about ransomware attacks, and how well-protected this setup would be against those.
What I'm trying to figure out is, what would happen if a malicious third party gains access to one of the devices, and is able to encrypt its drives.
 Let's first consider the Local Nas is compromised. If they encrypt drive 1, is one of my two proposed Sync-Options more robust/secure against these changes being propagated to the Remote Nas? If the whole drive is garbled, I would expect both Sync-Options to stop syncing, as the folders it is configured to sync are no longer available. However, if individual files are garbled, while keeping the folder structure intact, these changes would get propagated. Is that correct? Is there a way to protect against this?
 If the answer to (1a) is no, as I expect: would they be able to 'see' and encrypt BOTH drives of the Local Nas? If only drive 1 is accessible to them, and they encrypt it, its data is still recoverable from drive 2, even if a snapshot has been made. If however, both drives are accessible and encrypted, the situation is more serious. My question: is it possible to 'disconnect' or make unaccessible the snapshot drive of the Local Nas during normal operation? Is this common practice? Is there another solution to isolate the threat against each of the drives?
 If the answer to (1b) is also no, would there be more protection in using an externally (usb) connected hard drive, instead of internal drive 2, for the snapshots?
 Now let's consider the Remote Nas is compromised. (It's older but should receive security updates for another 3 years, so I'm assuming this isn't any more likely than the scenario above.) In this case, I assume it's very preferable to be using Sync-Option 1, as the changes are never propagated to the Local Nas. If the whole drive is garbled, I assume RTRR would throw me an error; if it's individual files, I assume the encryption is simply overwritten during the next replication. Is that correct? Would I even find out about the attack in that case? This is important because the Remote Nas is no longer reliable in that case and needs attention. 
 Either way, even when using Sync-Option 2, and even when the encrypted files get synced back to drive 1 of the Local Nas, I would still always have the snapshots on drive 2. Is that correct?
Many thanks for your kind replies!
--
Edit: changed randsome to ransomPrepared by Glenda Brown
The following group of Goldens who have earned the right to be included in the GRCA Field Dog Hall of Fame is listed in order of the year in which they were whelped, organized by decade. The year in parentheses reflects the year the title was earned. This was compiled in March 2017. Many thanks go to Charles Jones for his input and to Barbara Branstad, Marcia Schlehr, and Edell Schaefer for reviewing the initial list. If any errors are found, please contact me at: glendagldnblk@aol.com.
FC Rip OS FDHF (1939)

NFC King Midas of Woodend FDHF (1941)
FC Goldwood Tuck OS FDHF (1941)
FC Whitebridge Wally FDHF (1945)
Dual CH Stilrovin Nitro Express FDHF DDHF (1946)
FC Stilrovin Super Speed FDHF (1945)
NFC Shelter Cove Beauty FDHF (1944)
FC Pirate of Golden Valley FDHF (1945)
FC Royal Peter Golden Boy OS FDHF (1946)
FC The Golden Kidd FDHF (1949)
NFC-AFC Ready Always of Marianhill OS FDHF (1950)
FC-AFC; Can NFC Oakcreek's Van Cleve FDHF (1952)
NFC Beautywood's Tamarack FDHF (1950)
Dual CH-AFC Squawkie Hill Dapper Dexter FDHF DDHF (1952)
FC-AFC Oakcreek's Sir Dorchester OS FDHF (1953)
FC-AFC; Can Dual CH Rockhaven Raynard of Fo-Go-Ta FDHF (1954)
Space invader (greatarnav) mac os. 1948 FC Zip FDHF (1956)
FC Harbor City Rebel FDHF (1956)
Dual CH-AFC Craigmar Dustrack OS FDHF DDHF (1958)
FC Commanche Cayenne FDHF (1956)
FC-AFC Red Ruff FDHF (1956)
FC-AFC Oakcreek's Fremont FDHF (1955)
FC-AFC Joaquin Nugget FDHF (1958)
AFC Happy Thanksgiving CD FDHF (1957)
FC-AFC Rocky Mack FDHF (1959)
FC-AFC Macopin Expectation FDHF (1958)
FC-AFC Brandy Snifter FDHF (1959)
FC-AFC Briggs Lake Mac FDHF (1960)
AFC Sunshine Cake FDHF (1960)
FC-AFC Fairhaven Donner FDHF (1962)
AFC Pride of Roaring Canyon FDHF (1962)
AFC Gunnerman's Coin of Copper OS FDHF (1965)
FC-AFC Tyson Rowdy FDHF (1961)
FC Macopin Maximum FDHF (1960)
AFC Goldenrod's Thanksgiving FDHF (1960)
FC-AFC Stilrovin Luke Adew FDHF (1962)
FC-AFC Stilrovin Tuppee Tee FDHF (1963)
FC-AFC Nickolas of Logan's End FDHF (1962)
FC-AFC Ripp'n Ready FDHF (1966)
FC-AFC Stilrovin Savannah Gay FDHF (1964)
Crystals of power. 1961 FC-AFC Golden Rocket's Missile FDHF (1966)
FC-AFC Moll-Leo Cayenne OS FDHF (1968)
Dual CH-AFC Clickety Click FDHF DDHF (1970)
FC-AFC Bonnie Brooks Elmer OS FDHF (1973)
FC FTCH Bonnie Brook's Tuff And A Half FDHF (1971)
AFC Bonnie Brooks Mike FDHF (1973)
FC-AFC Misty's Sungold Lad CDX OS FDHF (1969)
FC-AFC Tioga Joe FDHF (1971) https://quickbonus-hausslottipshittivismachine.peatix.com.
FC-AFC Kinike Coquette CD FDHF (1972)
FC-AFC Sungold Sprite CD OD FDHF ((1972)
Dual CH-AFC Ronakers Novato Cain CD OS FDHF DDHF (1970)
FC-AFC Chief Sands OS FDHF (1972)
CH-AFC Honor's Darado of Spindrift OS FDHF DDHF (1977)
FC-AFC Kinike Chancellor OS FDHF (1974)
.FC-AFC Bonnie Brook's Red OS FDHF (1976)
FC-AFC Kate of Rocky-Vue FDHF (1976)
FC-AFC Tigathoe's Magic Marker OD FDHF (1975)
FC-AFC Tigathoe's Tonga FDHF (1976)
FC-AFC Benjamin Rajah Frisbie OS FDHF (1977)
Dual CH-AFC Tigathoe's Funky Farquar OS FDHF DDHF (1976)
FC-AFC Sungold Lad's Talisman OS FDHF (1978)
FC-AFC Tigathoe's Kiowa II OS FDHF (1977)
FC Sandstorm II FDHF (1979)
FC-AFC Northbreak Kinike Sir Jim OS FDHF (1977)
AFC Bonnie Belle Of Hunt Trails OD FDHF (1979)
FC-AFC Right-On Dynamite John FDHF (1979)
FC-AFC Pajims Klondyke FDHF (1980)
AFC Wild Fire of Riverview CDX OS FDHF (1983)
FC-AFC Topbrass Mandy OD FDHF (1980)
AFC Bens Enchanted Glory OD FDHF (1984)
FC-AFC Wyngates Sungold Sundance FDHF (1984)
FC-AFC Cherryhill's Rowdy Rascal FDHF (1983)
NAFC-FC Topbrass Cotton OS FDHF (1982)
AFC Sungolds T-Bill Sunsplasher MH FDHF (1986)
FC-AFC Casey Two of Fox Creek FDHF ((1987)
FC-AFC Windbreakers Smoke ‘n Zigzag OD FDHF (1984)
AFC Cranwood's Chill Factor MH OS FDHF ((1987)
FC-AFC Stony-Brooks' Gold Digger OD FDHF (1985)
FC-AFC Tangelo's Side Kick OS FDHF (1985)
FC-AFC Sangamo Red FDHF (1988)
FC-AFC Mioak's Main Event OS FDHF (1987)
FC-AFC Windbreakers Mighty Mo OS FDHF (1988)
FC Gian Carlo of Fox Creek OS FDHF (1990)
FC-AFC Stony-Brook's Jersey Devil OS FDHF (1988)
FC-AFC Topbrass Windbreaker Zap OS FDHF (1988)
FC-AFC Topbrass Tyonek FDHF (1992)
AFC Glenhaven Devil's Advocate UDT MH OS FDHF (1993)
AFC Topbrass Super Trooper OS FDHF (1993)
AFC Topbrass Comet OD FDHF (1994)
FC-AFC Valhaven Smoke'n Vindaloo FDHF (1990)
AFC Mioak's Rain Check OS FDHF (1991)
FC Topbrass Abilene MH FDHF (1995)
FC-AFC Mioak's Smoke'n Zeke OS FDHF (1993)
FC Windbreakers Premium Vintage OS FDHF (2000)
AFC Splashdown Texas Two Stepper OD FDHF (2001)
AFC Rosehill's Mr. Speaker MH OS FDHF ((1999)
AFC Caymans Rum Point Red OS FDHF (2001)
FC-AFC OTCH Topbrass Ascending Elijah OS FDHF (2001)
FC-AFC; FTCH-AFTCH TNT's Explosion UD OS FDHF (2004)
Gunnerman Mac Os Catalina1995 AFC Ida Red's Uncloudy Day OD FDHF (2004)
Gunnerman Mac Os Update1996 FC-AFC Glenhaven Htrs Mn Baronet MH OS FDHF (2003)
AFC Topbrass Pawsability OD FDHF (2004)
AFC Emberain Rugby OS FDHF (2003)
AFC Emberain Good Will Hunting FDHF (2007)
FC-AFC Emberain Beau Geste OS FDHF (2005)
FC-AFC Topbrass Band on the Run FDHF (2009)
FC Porjay's Crackerjack Surpriz FDHF (2010)
FC-AFC Steeple Hill Ranger OS FDHF (2007)

FC-AFC Lacrosse Max Q Jake JH OS FDHF (2007)
FC-AFC OTCH; FTCH-AFTCH MOTCH TNT's Stanley Steamer UDX OS OBHF FDHF (2008)
FC AFC Topbrass No Time To Paws SH FDHF CCA (2004)
FC AFC Port Costas Chantilly Lace FDHF (2016)
FC Topbrass Linekin's Riptide FDHF (2016)
AFC The Sunday Swimmer (2017)
FC-AFC Lacrosse KC's Don't Mess With Texas FDHF (2017)
Reviewed 7-29-17