common: Replaced buffer with pv as buffer

Also increased buffer size to 256M

roles/common/templates/backup_database.sh

@@ -5,7 +5,7 @@ set -euxo pipefail;
 file={{ backups_databases_directory | quote }}"/$1.sql.gpg";
 
 mysqldump --opt --databases "$1" |
-  buffer -m 128M -s 128K |
+  pv --quiet --buffer-size 256M |
   gpg --quiet --no-verbose --encrypt --recipient {{ backup_gpg_fingerprint | quote }} --trust-model always > "$file";
 chmod u+r-wx,g+r-wx,o+r-wx "$file";
 {{ global_helper_directory | quote }}/backup_rename.sh "$file";

roles/common/templates/backup_files.sh

@@ -13,7 +13,7 @@ dest={{ backups_files_directory | quote }}"/$name.tar.gpg";
 
 # Execution
 tar --directory="$dir" --create --file="$base" |
-  buffer -m 128M -s 128K |
+  pv --quiet --buffer-size 256M |
   gpg --quiet --no-verbose --compress-level 0 --encrypt --recipient {{ backup_gpg_fingerprint | quote }} --trust-model always > "$dest";
 chmod u+r-wx,g+r-wx,o+r-wx "$dest";
 {{ global_helper_directory | quote }}/backup_rename.sh "$dest";