How to make backups of heterogeneous content?

Good day!

I want to ask advice from habrazhiteli about backups.

There is a folder with the project, there are sources in it and a large number of graphic and video files. At the moment, backup script does as follows:

1. Dumps all databases to backup folder - each database is in its own folder, each table is in its own file
2. Packs up every folder with a base in .tar, then presses it all in 7z
3. Copies the folder with the project to the backup folder
4. Packs a folder with a project in .tar and presses 7z

Naturally there are a lot of graphics, it does not shrink and compression takes a very long time. At the moment there are about 2 gigabytes of custom graphic files.
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At the moment there are the following ideas:

• Copy only all text files, i.e. source codes and design graphics (there is not a lot of it) - use find or make a script that copies all the project subfolders separately, skipping folders with graphics
• Folders with graphics to copy separately and just pack in .tar
• Option with rsync thought, but I did not find an opportunity to do synchronization on windows machine

Any good advice and ideas are welcome.
The server runs on Gentoo Linux.