raspberry pi 3b stretch backup to local img file
script modifed from https://github.com/conanwhf/RaspberryPi-script/blob/master/rpi-backup.sh thanks to conanwhf!
Tested on my raspberry pi 3b with stretch having docker, hass.io, homebridge installed.
the idea is simple, from original conanwhf.
- create a .img file smaller than actual tf card size. actually used storage*1.5
- part img file to 2 partitions. 1 boot, 1 root and mount them.
- fill img file using rsync
- copy the img file to anywhere you like! you can then compress it to save space!
note:
- create img file to local folder /mnt you can change it to any folder or usb device mounted folder, do not change to ftp mounted folder using curlftpfs. I have tested it and it is not working. Problem is that it fails to mount img file from ftp folder mounted using curlftpfs.
- default img size is 1.5 larger than what is actually used on /dev/root and /dev/boot. eg. I use
df -Pand get 6.9GB used. but actual file copied to img file is 9GB by mounting img file and usingdf -Pon the img file. After I restore this img file to a new tf card. I get 7.7GB usingdf -P. I am confused. So I set 1.5 to make sure rsync works correctly. - After img file is created, you can copy it to a usb drive or a NAS.