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I'd like to run lftp in the background to create a backup of a rather large remote system. Due to a not-so-fast internet connection this will take over a week. Since nobody will be able to monitor the progress etc. during this time and the internet connection could have an outage, I wonder if there are some settings in lftp that will make it retry forever if something fails (most programs just retry a few times and if they still cannot (re-)connect terminate).

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Someone with enough rep please re-tag with lftp. – ThiefMaster Jan 25 at 16:46
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Without more information on the backup process... I can honestly only give you some bits of things to try.

If the "backup" is one megalithic file, you're going to have a harder time. Many FTP clients can "resume" a broken download automatically, and with the help of the -c parameter, lftp can indeed resume uploads & downloads. Additionally, there is a command to repeat the command until OK... i.e.: 

lftp repeat --until-ok put -c /some/dir/the-backup ftp://username@host
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Actually... I'm not 100% sure that will work... I believe that repeat only works as long as the connection is active. You may try scripting it... put it in a bash-script and loop until the exit code is 0. – TheCompWiz Jan 25 at 17:33
I have multiple files in a folder which I'll copy through lftp's mirror command. – ThiefMaster Jan 25 at 18:02
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