Backup and syncing are similar but different system processes - at least in the way that I was taught
Syncing is a derivation of synchronising which is a system where two or more locations are kept identical. This can be one way or two way (or multiway)
Assuming three synchronised data stores - A, B, & C
In Full Synching
any change in
any of the locations will be replicated
immediately without human intervention in the other two locations. This system can have problems with modern Ransomware attacks as the application of locks on a file on A can be replicated, (posh word for copied,) to C and D
The way that Microsoft's OneDrive or Google's Google Drive work meets the criteria of a Full Synching MultiWay system (that is backed up at the server end so can
if used carefully be used to recover data locally after a crash
In the same three way system One way synchronization requires a master and slave system(s) if we use A as the master ...
Any change to store A will be replicated instantly in both B & C but changes in B or C will not make any change in A and should, in reality, be reversed to be identical to A
A backup is a copy of the state of data at a single point in time If at any time you copy the contents of A, B or C above you are making a backup
A backup is normally removed from the source date after creation to protect the integrity of the backup data...