I've recently discovered
rsync and started to use it. I want to compare files based on
filesize only. If both match, then skip, if different size, then keep dest version (renamed) and copy from source.
I gave it a try and it failed to create backup file with options
rsync --size-only -avbr for one file with same name and different size, just replacing it (source was NTFS, destination exFAT). I created test environment on
tmpfs drive, first with dummy files - backup was created, then actually copied that two files and again backup copy was created with
~ at the end.
I did several tries with original locations to be sure that issue persists, including omitting
a flag with thoughts that maybe on non Linux file systems
rsync cannot properly read some properties. And creating small file with name
12345678 and small text type content - still same issue - just replacement.
rsync does not keep original file in my case? I have two guesses: either it still somehow uses timestamp if
backup option is added to
size-only and just copying files from non-Linux file systems to
tmpfs mangled some important details or
rsync cannot be expected to work correctly with non-Linux native file systems.
System Linux Mint 19. NTFS and exFAT mounted
type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096,uhelper=udisks2)