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A lot of people are interested in a Raspberry Pi and want to get some idea about the operating system running on Pi without the need to buy a Pi first. I actually searched for a convenient way to test a backup script called raspiBackup I wrote for the Raspberry Pi. A nice way to evaluate Raspbian or to run any tests is to use QEMU to emulate the Raspberry Pi. Note that special Pi hardware like GPIO et al cannot be simulated. It's just the processor which is simulated. You need a Raspbian image and a system with Linux or Windows. Today I configured my system to run a Pi in QEMU and in the following article I explain step by step how I installed and configured QEMU on my Debian based Linux. The image has a networking connection right after startup and will use the existing host network connection with NAT. Finally a script is provided which executes the steps described and simplifies the image creation process.
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PiShrink is a useful tool to compress backups created with win32diskimager and other windows tools as a full backup to reduce them to a minimum size.
It's a hack and works a lot of time. Unfortunatey there are a lot of situations you get an ugly error message which are created because of missing checks in the code.
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It seems ACLs are more and more used by applications running on Debian rsp RaspberryOS. Unfortunately rsync does complain about ACLs with RC23 when files with ACLs are copied with rsync onto a nfs mounted partition. Today I detected it's possible but you have to use an important option when you mount a partition via nfs.
Read more: How to backup ACLs with rsync on a nfs mounted partition?
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Some SQL DBMs allow to create recursive queries. That's a feature of DB2 (free download ), SQL Server and Oracle. Unfortunately mySQL misses this feature. But every recursive algorithm can be written in a non recursive way - so it's not clear whether this is a need or just a nice DBMS feature. Anyhow - it's an interesting topic.