How can I use rsync (but neither rsnapshot nor rdiff-backup nor any other application) to create a differential backup of a directory located on my local drive to another directory located on that same local drive?
F. Hauri posted the following in an anwser to How to create a local backup?:
#!/bin/bash backRepo=/media/mydisk backSrce=/home/user backDest=home backCopy=copy backCount=9 [ -d "$backRepo/$backDest" ] || mkdir "$backRepo/$backDest" cd $backSrce || exit 1 rsync -ax --delete --exclude '*~' --exclude '.DStore' . "$backRepo/$backDest/." cd $backRepo [ -d "$backCopy.$backCount" ] && rm -fR "$backCopy.$backCount" for ((i=$backCount;i--;));do [ -d "$backCopy.$i" ] && mv "$backCopy.$i" "$backCopy.$((i+1))" done ((i++)) cp -al $backDest $backCopy.$i
It seems like the above script is fairly close to what I want, but frankly despite spending about an hour studying Easy Automated Snapshot-Style Backups with Linux and Rsync I still only have a vague idea of how to make rsync do what I want.
Here's my use case:
I am editing a video locally on my machine. The sum of all of the hundreds of files associated with that video will be less than 5 gb (five gigabytes).
Currently, I use Grsync to back up my internal drive to an external USB drive. Although I actually figured out how to accomplish the identical task using rsync I prefer using Grsync because I merely need to launch it and then click on one button to backup my internal directory containing my video files to my external USB drive. The entire process is silky smooth.
Every few hours, I want a fairly smooth way to back up my the above-mentioned data associated with my video, to my Google Drive account. I don’t mind manually choosing to upload a folder to Google Drive. I actually sort of prefer having to do so because it would help me to ensure the backup was actually being accomplished.
Every few nights before I go to bed, I have been copying the entire folder containing the video files, which contains many gigs of data, up to my Google Drive account.
I prefer differential backups to incremental ones because in case I were to need to restore my data from Google Drive I would likely be able to do so manually without becoming confused.
Please keep in mind that I am certainly not a unix sys admin at a large corporation supporting hundreds of users. I am a merely one guy who wants an easy method, but not necessarily a completely automated method, to back up his data offsite every few hours in case of a catastrophic loss of data, which would be most likely due to the theft of my computer. I am almost certain rsync can do what I want. Therefore, I am reluctant to install another application.