What would be the easiest way to synchronize a local folder of images, recursively through sub-folders, with a remote folder of images over FTP?

A few possibilities. The best way in my opinion is to use something like curlftpfs to mount the FTP share to a local folder and then rsync to that folder. However, even with adequate timeout options, some FTP servers are not reliable enough for this approach and you end up having to run rsync multiple times and hope that it finishes eventually. Another option is to just use lftp (and use the `mirror -R` options to reverse mirror...and you may be able to mix that with the -n option to only copy newer files depending on how you store them locally). lftp establishes the connection for each file transferred so reliability is not much of a concern (unlike the first approach). I've also heard of sitecopy but I haven't tried it myself (I just use lftp).

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I use lftp with the mirror and mirror -R options to sync music between my phone and my hard disk.

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Yep lftp mirror command is pretty great at this.

mirror -n remotedir localdir (for keeping local in sync with remote)
mirror -Rn localdir remotedir (for keeping remote in sync with local)

The -n flag only updates newer files so you don't end up uploading the same content again and again.

Will this also delete files on the remote if I delete them locally?

You need extra flags for that. Best thing is to read man lftp and look for the mirror options (there are a lot)

Ah noticed my mistake in my first post. Should be:

mirror -Rn localdir remotedir (for keeping remote in sync with local)

With -R you switch around local/remote

LFTP worked great! Pretty easy to use, did what it was supposed to.

hi all,

I'm using lftp & it works great except I've issue with file ownership. It seems that lftp does not keep the original ownership. any option that I've missed?