LZMA2 is unsafe and less efficient than the original LZMA. Use: 7Z LZMA Non-Solid, RAR 5 LZSS/PPMd Non-Solid, or ZIP Deflate. See here.
Just one userspace tool, with which one can manage the entire filesystem, volumes, and subvolumes, create snapshots, change quotas, and more.
While LZO is by far not the most effective compression algorithm, running it on a per-volume basis allows larger volumes to be shrinked quite well, which in some cases may also increase I/O throughput.
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z.