My best development PC has been plagued by rare data corruption problems that occur most often when updating or handling large files. They were so rare (half a dozen times a year) that I lived with them - until some substantial overnight file processing started hitting issues almost every time I tried it.
Examination of the files showed very infrequent but catastrophic 1 bit errors (for example an 'L' turning to an 'M' in an ascii file).
Using copies of Joomla sites to safely make and test content changes
When we need to make significant interdependent changes to content on a live Joomla site, working on a copy is the only safe option. If you do not use a copy then the work in progress or any mistakes could break the live site.
I often print out a sheet with the module positions on it when I am working on a site but if the printout is not handy I type in the url with index.php?tp=2 at the end to display the module positions.
Sometimes I have text files containing simple one line records that are used on more than one computer so they may get out of sync. For example, password files maintained on more than one machine, user records or the like.
"Free and Open Source Software" (FOSS) is behind the Internet revolution. Without FOSS, if it existed at all, the Internet would be very different and much smaller. It started with the protocols and basic applications but FOSS is no longer niche or the domain of geeks. Apache serves up most of the worlds web sites. MySQL provides the database to power many of the worlds websites and increasingly Firefox is being used by everyone to browse web sites.